Mobile IPv4 Release Notes A.02.01

HP-UX Mobile IPv4 Release Notes
What’s in This Version
Chapter 18
• Reverse Tunneling - HP-UX Mobile IPv4 software provides reverse tunneling support in
the mobility agents (HA, FA, and HA/FA). This allows for datagrams sent by a Mobile
Node to be tunneled to its Home Agent from its Care-of Address (Foreign Agent or
Co-located). The Home Agent then decapsulates the tunneled datagram and routes it to
the original destination. This feature is desirable when the Mobile Node visits foreign
networks where the routers require that the source address of datagrams be topologically
correct.
Version A.02.01 also includes the following features:
• IP Mobility Support for IPv4 - HP-UX Mobile IPv4 provides Mobile Nodes, the ability to
roam through the Internet while maintaining their home address and network
connection. HP-UX Mobile IPv4 allows transparent routing of IP datagrams to these
Mobile Nodes as they migrate from their home network to other networks, either within
the same administrative domain or to other administrative domains on the Internet.
• IP Encapsulation and Tunneling - When located away from its home network, a Mobile
Node is associated with a Care-of Address, which provides information about its current
point of attachment to the Internet. Datagrams sent to the Mobile Node’s home address
are intercepted by its Home Agent, encapsulated and tunneled to the Mobile Node’s COA.
When these encapsulated datagrams arrive at the tunnel endpoint, they are decapsulated
and delivered to the Mobile Node.
• Route Optimization - Route optimization in HP-UX Mobile IPv4 product facilitates the
routing of datagrams directly from a Correspondent Node (CN) to a Mobile Node’s Care-of
Address without going through the Mobile Node’s home network.